تحلیل عددی و تجربی شکل‌دهی افزایشی دونقطه‌ای قطعات با هندسه پیچیده

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری / گروه مکانیک، دانشکده مهندسی، دانشگاه بیرجند

2 عضو هیات علمی / گروه مکانیک، دانشکده مهندسی، دانشگاه بیرجند

چکیده

در این پژوهش به‌ کمک شبیه­ سازی و مقایسه نتایج آن با مشاهدات آزمایشگاهی به بررسی عددی و تجربی فرآیند شکل‌دهی افزایشی دونقطه­ای بر روی قطعات با فُرم آزاد پرداخته شده است. بر اساس بررسی­ های انجام شده، شبیه­ سازی شکل‌دهی افزایشی دونقطه­ای در معدود تحقیقاتی برای قطعات با فرم­های مشخص نظیر نیم­کره و هرم منتظم ناقص که مسیر ابزار به سادگی با توابع ریاضی قابل تعریف است، انجام شده است. این در حالی است که روش اتخاذ شده برای شبیه­ سازی شکل‌دهی افزایشی دونقطه­ای در این مقاله محدود به فرم خاصی نیست. در این مقاله شبیه­ سازی عددی برای لوله اگزوز یک نوع هلیکوپتر انجام شده و سپس با کمک آزمایش­های تجربی صحت نتایج شبیه­ سازی تایید شده است. با مقایسه نمودار حد شکل‌دهی ورق مورد نظر و نمودارهای کرنش­های اصلی و فرعی بدست آمده از شبیه­ سازی در حین فرآیند می­توان از سلامت ورق و به طور کلی امکان انجام شکل‌دهی افزایشی دو نقطه­ای بر روی قطعه مورد نظر اطمینان حاصل کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Analyses of two-point incremental forming for parts with complex geometries

نویسندگان [English]

  • Mojtaba Esmailian 1
  • Khalil Khalili 2
1 Phd Student / Department of Mechanical Engineering, University of Birjand
2 Professor / Department of Mechanical Engineering, University of Birjand
چکیده [English]

In this study, by comparing the simulation results and experimental observations, the incremental forming of free-form parts is investigated experimentally and numerically. In the literature, only a few works regarding numerical simulation of two-point incremental forming method have concentrated on specific geometries, such as truncated hemisphere and truncated regular pyramid, where the tool path can be easily defined by mathematical functions. However, in this paper, the method used to simulate two-point incremental forming is not limited to a specific form. In this paper, a numerical simulation is performed for the exhaust tube of a helicopter, and then, the simulation results are verified with experimental data. By comparing the forming limit diagrams of the sheet under study and the major and minor strain values from the simulation during the process, the integrity of the sheet, and in general, the possibility of using two-point incremental forming of the part can be ensured.

کلیدواژه‌ها [English]

  • Two-point incremental forming
  • finite element method
  • Free-form
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